Alt-BEAM Archive

Message #08344



To: beam@sgiblab.sgi.com
From: Senior kyled@cruzers.com
Date: Fri, 17 Dec 1999 20:51:25 -0700
Subject: [alt-beam] Re: PCB iron on transfers


Wow 60 boards for 130? That's a lot better than I've been hearing. I
hear ya though, because my work will never match those Hextiles from
Tilden. Never ! :)

I'll check around more I suppose. Do they solder the components onto the
boards for you?

Thanks,
Kyle

Dennison Bertram wrote:
>
> Yeh. I payed $130. I know it's alot, but if your serious. That's simply what
> you end up having to do. Seriuoly, I made a batch of like ~60 SMD Hextile
> boards. I could have never have done that by hand or by transfer. It's a
> much more involved process to get it fabricated for you, but eh, like I
> said, you'll learn from experince. Trust me, I had my three dollar day's
> too. Still do. But that's a pain in the REAR if your serious. It's nice to
> test designs and stuff, but it has real limits, and the work ratio just
> isn't worth it at all.
>
> dennison
>
> I've requested quotes tho from local places and they want 100 - 300 us
> bucks! What are you paying? That is WAY too much when I could make them
> for three dollars.
>
> -Kyle
>
> Dennison Bertram wrote:
> >
> > Stay away from Iron on Transfers. I don't care what people say, they just
> > don't work. They seriously will be a huge dissapointment. Your better off
> to
> > simply put some time and energy into a good design, and spend the extra
> > bucks to have it fashioned at a real PCB etching facility. Seriously, I
> know
> > you're going to have to do it the hard way a few times before you learn,
> but
> > it pays off.
> >
> > dennison
> >
> > -----Original Message-----
> > From: owner-beam@sgiblab.sgi.com [mailto:owner-beam@sgiblab.sgi.com]On
> > Behalf Of jester96@iname.com
> > Sent: Friday, December 17, 1999 7:53 PM
> > To: beam@sgiblab.sgi.com
> > Subject: PCB iron on transfers
> >
> > I know you can get PCB Iron on transfers for laser printers, but what
> about
> > inkjets???
> >
> > I work at a computer store, and we have T-Shirt transfers for inkjets.
> Would
> > they work do you think or would the solution etch right through it? Has
> > anyone tried it before?
> >
> > The only way I can make PCBs now is with a pen, and that it's a pain in
> the
> > arse, so I am looking for something better. How much do cheap UV boxes
> cost?
> >
> > Thanks
> > Chris
> >
> > ---------------------------------------------------
> > Get free personalized email at http://www.iname.com



8345 Fri, 17 Dec 1999 20:53:57 -0700 [alt-beam] Re: Bi ped beam@sgiblab.sgi.com Senior An idea I had a ways back for a four-legged walker's feet:
Gvie the feet/ankle one degree of freedon, paralell with the direction
of walking. Let them swivel freely or give them a bit of resistance with
springs. Use a solenoid, a brake, or something of that sort so that all
we have to do is put the foot down, and it will automatically match the
angle of the surface, and then lock it in that position before any
weight is put on it.

??

Kyle

Bruce Robinson wrote:
>
> Ian wrote:
> >
> > Hi again, I'm in the design phase of a new walker
> > I have planned. It's going to be a biped walker
> > (see attachment) ...
> >
> > ... I am sort of leaning towards a BS2 for control
> > and adding BEAM in for some stuff. Not sure what yet.
>
> Hi, Ian.
>
> Think about stability, from the ground up. Doesn't matter if you're
> talking about static or dynamic stability.
>
> The feet have to conform to the surface as they come down. Spring loaded
> feet won't be enough, but you might want some very slight spring motion
> between the foot servo arm and the foot itself. Consider sensors that
> detect when one edge of a foot is about to touch down, and then use them
> to control the angle of the foot. You could use Nv/Nu circuits to do
> that, just as the human body takes care of such things at the spinal
> level. Your control system might anticipate the angle and adjust the
> foot accordingly, but I promise, you'll need that final feedback for
> fine-tuning.
>
> To some extent, you may be able to carry this idea up to the next level
> of joint. Beam sub-systems, controlled or over-ridden by a high level
> controller.
>
> BTW, in your walking experiments, have you tried to keep your ankles
> absolutely stiff in the fore-and-aft orientation? Your design only
> allows side-to-side motion -- pretty hard to mimic on a human ankle. Try
> it. It sure ain't easy.
>
> Bruce



8346 Sat, 18 Dec 1999 00:03:37 EST [alt-beam] Re: BEAM Flocking (HPV) alt-beam@egroups.com TurtleTek@aol.com In a message dated 12/17/99 7:14:34 PM Central Standard Time,
kyled@cruzers.com writes:

> And then there's another question, that i always ask myself: What's the
> point? Okay, so say we get a flock up and running, with everyone
> supporting eachother, no one dying. So what? Wow we'll get to look at
> it. WE need a purpose! What are they doing?
>
> So, that's my whole 2 cents.

My thought is that BEAM isn't based on the idea of robots being "workers" but
rather of bots trying to be "alive". This new feature will allow these
photovores to gather light more effectively and increase their chances for
survival in the real world (granted, the "real world" so far is just a table
top..). This is the very objective of photovores, to survive.
To search out and follow light is no big deal, it is one of the most
basic things a robot can be built to do. I see these programmed bots with
batteries do that and I am far from impressed. However, I see BEAM photovores
searching out light, their life source, in order to feed and survive I see
something in the right direction.

-Brien the TurtleTek



8347 Fri, 17 Dec 1999 22:03:56 -0700 [alt-beam] Re: Bi ped Ian Hey, I was just browsing some web sites related to biped walkers and it
seems most are 10 motors designs. The 3 extra from my design are
forward/backward motion on the ankles and a motor for each leg for turning.
To solve the ankle problem I'm going to do something like this (modified for
descriptive purposes).

Ankles ----

1) Ankle pivot (forward/backward)
2) Side to side is controlled by servo
3) pivoting rod from the tip of the foot to the higher section of the leg
4) Thus when the knee bends the ankle will bend to keep the body centered
above the feet.

How the robot will balance itself ----

1) 4 pressure sensors in each foot will let the robot know where the
pressure is and then adjust so the center of gravity is right over the
middle of the foot.

How to achieve balance ----

1) Hip motors move to swing the body back and forth changing the center of
gravity.

Laterz
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